Denver Harper
, Senior Scientist, Indiana Geological Survey, Indiana University Bloomington, sits on a "gob pile" near Dugger, Indiana. In the pile is material left behind from the mining and coal purification process.
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Denver Harper, Senior
Scientist, Indiana Geological Survey, Indiana University Bloomington, sits on a
"gob pile" near Dugger, Indiana. In the pile is material left behind from the mining
and coal purification process.